Dendrobium Nobile, Yellowing Leaves with Black Blodges
Please can anyone tell me what is ailing this Dendrobium I am loking after which I think is a Dendrobium nobile? In bloom it has masses of white flowers up the stem and when I was given it to look after there was only the one thick central stem. One leaf has yellowed and has black blodges on it. Another leaf is starting to go yellow and has a small black spot on it. To be on the safe side I have moved it away from my other orchids but it is in the same room. I hope there is no danger of the ailment spreading to the other orchids in that room.
Thank you for helping.
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